For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is1 KΩ , then the input signal voltage is
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a
10 mV
b
20 mV
c
30 mV
d
15 mV
answer is B.
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Detailed Solution
Here, RC=2kΩ=2000Ω,V0=4 Vβ=100,RB=1kΩ=1000Ω,Vi=? Voltage gain, A=βRCRB=100×20001000=200 Also, A=V0Vi or, Vi=V0A=4200=2100 V=20mV
For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is1 KΩ , then the input signal voltage is